Product Overview
Q235B H Beams are made from low-carbon structural steel according to the national standard GB/T 700-2006 "Carbon Structural Steel". Q235B is one of the most widely used steel products in China due to its cost-effectiveness, good strength, and excellent weldability.
"Q" indicates the yield point, and "235" represents the minimum yield strength in MPa.
The "B" grade ensures room temperature impact testing, giving Q235B superior mechanical properties compared with Q235A.
Q235B H Beams are suitable for construction, bridge engineering, machinery, and general structural applications.
Chemical Composition of Q235B Steel
| Element | Max % |
|---|---|
| Carbon (C) | 0.20 |
| Silicon (Si) | 0.35 |
| Manganese (Mn) | 1.4 |
| Phosphorus (P) | 0.045 |
| Sulfur (S) | 0.045 |
| Chromium (Cr) | ≤0.30 |
| Nickel (Ni) | ≤0.30 |
| Copper (Cu) | ≤0.30 |
Deoxidation Method: F (boiling steel), b (semi-killed), Z/TZ (killed steel)
Killed steel may not carry a specific symbol.
Mechanical Properties
| Property | Beam Size ≤16 mm | 16–40 mm | 40–100 mm | 100–150 mm | 150–200 mm |
|---|---|---|---|---|---|
| Yield Strength (MPa) | ≥235 | ≥225 | ≥215 | ≥195 | ≥185 |
| Tensile Strength (MPa) | 370–500 | 370–500 | 370–500 | 370–500 | 370–500 |
| Impact Test (V-notch, 20℃) | ≥27 J | ≥27 J | ≥27 J | ≥27 J | ≥27 J |
Elongation: 20–23%, providing excellent flexibility for bending and fabrication.
Design pressure: ≤1.6 MPa, service temperature: 0–350℃, suitable for steel thickness ≥20mm.
Specifications of Q235B H Beams
Height (H): 100–900 mm
Flange Width (B): 100–300 mm
Web Thickness (t1): 6–16 mm
Flange Thickness (t2): 8–28 mm
Length: 6–12 m (customizable)
Note: Q235B H Beams are fabricated from high-quality rolled steel with standardized dimensions for heavy-duty structural applications.
Key Advantages
High Strength and Durability
Yield strength ≥235 MPa, tensile strength 370–500 MPa ensures load-bearing capability for buildings, bridges, and industrial structures.
Can support frameworks weighing several hundred tons, depending on size and configuration.
Excellent Weldability and Fabrication
Low carbon content (≤0.20%) allows easy cutting, welding, and cold forming.
Can be fabricated into H-beams, I-beams, channels, and angles.
Outstanding Plasticity
Elongation at break: 20–23%, allowing cold bending and complex structural shaping without compromising integrity.
Versatile Applications
Suitable for construction, bridges, towers, machinery, vehicles, and container frameworks.
Resistant to moderate environmental corrosion.
Cost-Effective
Durable steel reduces long-term maintenance costs by up to 30%, ensuring a long service life.
Applications of Q235B H Beams
Structural frameworks: Factories, warehouses, commercial buildings (beam spans up to 12 m supported).
Civil infrastructure: Bridges, towers, transmission structures (tensile stress up to 500 MPa).
Machinery components: Brackets, rods, supports, and mechanical frameworks.
Vehicles and containers: Load-bearing frames, transport containers, heavy equipment structures.
